Doug Pederson and Matt Nagy developed a strong friendship as assistants on Andy Reid’s coaching staff in Kansas City.Since then, both men have moved into prominent head-coaching roles. Their friendship will be put on hold for a few hours when Pederson’s defending Super Bowl champion Philadelphia Eagles (9-7) visit Nagy’s Chicago Bears (12-4) on Sunday afternoon in the NFC divisional playoffs.Few know Pederson’s offensive system as well as Nagy does — and few know Nagy’s system as well as Pederson does.”You can draw parallels from Coach Reid,” Pederson said this week in comments published by The Morning Call of Allentown, Pa. “We both kind of learned under him. I know Matt is very — he definitely is an aggressive coach, he has an aggressive mindset, he’s very creative. That’s what you’re seeing on tape and in games. So I think there are some similarities there.”The coaches’ familiarity could make for a high-stakes, tight-knit contest on the Chicago lakefront.The Bears enter the postseason having won four games in a row and nine of their past 10. They finished the regular season with the league’s third-ranked defense (299.7 yards allowed per game), which took pressure off of their 21st-ranked offense (343.9 yards per game).Meanwhile, the Eagles secured a wild-card playoff berth on the final day of the regular season thanks to a win over the Washington Redskins, coupled with a loss by the Minnesota Vikings against the Bears. Philadelphia finished in the middle of the pack on both sides of the ball, posting the No. 14 total offense (365.3 yards per game) and the No. 23 total defense (366.2 yards allowed per game).But the Eagles have plenty of experience in the spotlight after last season’s title run. This will be the Bears’ first playoff game since 2010.It will be the biggest test yet for Bears quarterback Mitchell Trubisky, who threw for 3,223 yards, 24 touchdowns and 12 interceptions in his second season. Jordan Howard led the team on the ground with 935 yards and nine touchdowns, while Allen Robinson led all receivers with 735 yards on 55 catches, including four for touchdowns.